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23=20+c/3
We move all terms to the left:
23-(20+c/3)=0
We add all the numbers together, and all the variables
-(c/3+20)+23=0
We get rid of parentheses
-c/3-20+23=0
We multiply all the terms by the denominator
-c-20*3+23*3=0
We add all the numbers together, and all the variables
-1c+9=0
We move all terms containing c to the left, all other terms to the right
-c=-9
c=-9/-1
c=+9
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